Is there someone behind you? Is there someone at your bedside? Did you see the person at the window? If you think someone is there, then someone is.
The old man often said that people have three lamps, one on the head and two on the shoulders, which represent the three souls of heaven, earth and man respectively. When walking alone at night, someone calls out, "Don't look back." When you turn around, three lights will go out and one will go out. When you turn back again, three lights will go out and two will go out. When the three lights sound, the gate to hell will open.
Intent: Is there someone behind you?